<template>
  <div ref="wrapper">
    <slot></slot>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll'
  export default {
    props: {
      probeType: {
        type: Number,
        default: 1
      },
      click: {
        type: Boolean,
        default: true
      },
      data: {
        type: Array,
        default: null
      },
      listenScroll: {
          type: Boolean,
          default: false
      },
      pullup: {
          type: Boolean,
          default: false
      },
      beforeScroll: {
          type: Boolean,
          default: false
      }
    },
    mounted() {
      setTimeout(() => {
        this._initScroll()
      }, 20)
    },
    methods: {
        _initScroll() {
            if (!this.$refs.wrapper) {
                return
            }
            this.scroll = new BScroll(this.$refs.wrapper, {
                probeType: this.probeType,
              click: this.click
            })
          if (this.listenScroll) {
                let me = this
                this.scroll.on('scroll', (pos) => {
                    me.$emit('scroll', pos)
                })
          }
          if (this.pullup) {
                this.scroll.on('scrollEnd', () => {
                    if (this.scroll.y <= (this.scroll.maxScrollY + 50)) {
                        this.$emit('scrollToEnd')
                  }
                })
          }
          if (this.beforeScroll) {
                this.scroll.on('beforeScrollStart', () => {
                     this.$emit('beforeScroll')
                })
          }
        },
      enable() {
            this.scroll && this.scroll.enable()
      },
      disable() {
        this.scroll && this.scroll.disable()
      },
      refresh() {
            this.scroll && this.scroll.refresh()
      },
      scrollTo() {
            this.scroll && this.scroll.scrollTo.apply(this.scroll, arguments)
      },
      scrollToElement() {
        this.scroll && this.scroll.scrollToElement.apply(this.scroll, arguments)
      }
    },
    watch: {
        data() {
          setTimeout(() => {
            this.refresh()
          }, 20)
        }
    }
  }
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">

</style>
